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authorTycho Andersen <tycho@tycho.pizza>2021-01-21 14:19:28 +0100
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 14:27:17 +0100
commitc7c7a1a18af4c3bb7749d33e3df3acdf0a95bbb5 (patch)
tree70987010043f447700ed119e1b05b8fb429af5dd /fs/ecryptfs
parente65ce2a50cf6af216bea6fd80d771fcbb4c0aaa1 (diff)
xattr: handle idmapped mounts
When interacting with extended attributes the vfs verifies that the caller is privileged over the inode with which the extended attribute is associated. For posix access and posix default extended attributes a uid or gid can be stored on-disk. Let the functions handle posix extended attributes on idmapped mounts. If the inode is accessed through an idmapped mount we need to map it according to the mount's user namespace. Afterwards the checks are identical to non-idmapped mounts. This has no effect for e.g. security xattrs since they don't store uids or gids and don't perform permission checks on them like posix acls do. Link: https://lore.kernel.org/r/20210121131959.646623-10-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Tycho Andersen <tycho@tycho.pizza> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/ecryptfs')
-rw-r--r--fs/ecryptfs/crypto.c4
-rw-r--r--fs/ecryptfs/inode.c5
-rw-r--r--fs/ecryptfs/mmap.c4
3 files changed, 7 insertions, 6 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 0681540c48d9..943e523f4c9d 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -1110,8 +1110,8 @@ ecryptfs_write_metadata_to_xattr(struct dentry *ecryptfs_dentry,
}
inode_lock(lower_inode);
- rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
- page_virt, size, 0);
+ rc = __vfs_setxattr(&init_user_ns, lower_dentry, lower_inode,
+ ECRYPTFS_XATTR_NAME, page_virt, size, 0);
if (!rc && ecryptfs_inode)
fsstack_copy_attr_all(ecryptfs_inode, lower_inode);
inode_unlock(lower_inode);
diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index ac6472a82567..b9ccc4085d46 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -1024,7 +1024,8 @@ ecryptfs_setxattr(struct dentry *dentry, struct inode *inode,
rc = -EOPNOTSUPP;
goto out;
}
- rc = vfs_setxattr(lower_dentry, name, value, size, flags);
+ rc = vfs_setxattr(&init_user_ns, lower_dentry, name, value, size,
+ flags);
if (!rc && inode)
fsstack_copy_attr_all(inode, d_inode(lower_dentry));
out:
@@ -1089,7 +1090,7 @@ static int ecryptfs_removexattr(struct dentry *dentry, struct inode *inode,
goto out;
}
inode_lock(lower_inode);
- rc = __vfs_removexattr(lower_dentry, name);
+ rc = __vfs_removexattr(&init_user_ns, lower_dentry, name);
inode_unlock(lower_inode);
out:
return rc;
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 019572c6b39a..2f333a40ff4d 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -426,8 +426,8 @@ static int ecryptfs_write_inode_size_to_xattr(struct inode *ecryptfs_inode)
if (size < 0)
size = 8;
put_unaligned_be64(i_size_read(ecryptfs_inode), xattr_virt);
- rc = __vfs_setxattr(lower_dentry, lower_inode, ECRYPTFS_XATTR_NAME,
- xattr_virt, size, 0);
+ rc = __vfs_setxattr(&init_user_ns, lower_dentry, lower_inode,
+ ECRYPTFS_XATTR_NAME, xattr_virt, size, 0);
inode_unlock(lower_inode);
if (rc)
printk(KERN_ERR "Error whilst attempting to write inode size "